Your points are cogent, however blogs are more like conversations than books. With a book, you iterate a few times with your editor(s), you pass drafts around,

Your points are cogent, however blogs are more like conversations than books. With a book, you iterate a few times with your editor(s), you pass drafts around, and hopefully discover which examples aren’t clear before you publish. Everything else must wait for the second edition. With a blog post, you can revise the original based on feedback, but the odds are that none of the people who read it the first time will see the revision. A follow-up post is the best way to expand/expound/correct yourself. I agree that the first post could have been even better, but given the first post being what it was, putting out a second post seems like the right thing to do.